Locomotive cross head structure



July 16, 1940. H. s. BURNHA'M STRUCTURE LOCOMOTIVE GROSS HEAD 2 Sheets-Sheet 1 Filed June 22, 1938 INVENTOR Hal-r SBum/z am BY 6 I f NEY July 16, 1940.

H. s. BURNHAM LOCOMOTIVE CROSS HEAD STRUCTURE 2 Sheets-Sheet 2 Filed June 22, 1938 INVENTOR Haw/*7 Burnham 1! NEY Patented July 16,1940 a 2,208,322

UNITED STATES rArNT OFFICE LOCOMOTIVE CROSS HEAD STRUCTURE Harry S. Burnham, Schenectady, N. Y., assignor I to American Locomotive Company, New York,

N. Y a corporation of New York Application June 22, 1938, Serial No. 215,173

3 Claims. (01. 3083) This invention relates to locomotive cross head pendent, from a structural standpoint, of the I structures and has for an object the devising of main and piston rods.

a rigid composite frame independent of the main The plates are provided with bosses l5 upon rod and piston rod and serving as the cross head Which the pin i3 is mounted, thereby providing a 5 and wrist pin f r the rod strong support for the pin, and providing a very 5 Other objects of and advantages achieved by rigid j t between the p end p this invention will be apparent from the follow- The bolt IA is extended beyond t Outer plate ing description thereof and the claims appended 5 and has mounted thereon, between this plate hereto, and the nuts IS, a collar H which provides a H) The invention is illustrated in the acgompanybearing for the combination link of the valve ing drawings wherein Figure 1, at the right, is gear (not shown). I a side elevation, and at the left a section on h m in rod l8 of the structure is forked at the line I--I of Fig. 2, of a locomotive cross head its front end p v n branches d a structure embodying the present invention, the piston rod 2| is d sp sed at ts rear end between cross head guide t being shown and t pistgn the branches. The rods are orificed for mount- 1 rod and main rod being shown fragmentally; ihg them p the P !3, the p Outer face Fig 2 i a ti on t i I1 1 of Fig 1 being stepped, as are also the orifices (considered parts being shown in full; Fig. 3 is a section on llectively), according to usual practice. th line 111.41 of p 1 parts being h in The rods are assembled together and the pin elevation, the guide being shown in section and is inserted through the orifices in an obvious 20 the guide bracket being shown in dot and dash manner- The guide i being in p the p a lines; Fig. 4 is an enlarged elevation of the wrist 5 are then assembled- W the p 10 pin and certain parts associated therewith, parts and guide and e bolts 3 and M are then' of t cross head being Shown in dot and dash inserted in place and the nuts thereof screwed li Fig 5 is a Section on the line v v ,of tight, the collar ll being first mounted on the 25 Fig. 4:; and Fig. 6 is a section, similar to Fig. 3, bolt The spacing by he lock 1 and pin I3 enlarged, and showing frictionless bearing means. is Suificieht in extent to p ov e a S iding Working Referring to the invention as shown in Figs. 1 fit between the Cross head and gu de. A very to 5, a cross head guide I, provided at each side rigid ame isprovided, forming a Strong uppo with a pmmlity f ways 2 is bolted t a bracket for the rods, which are mounted on the wrist pin, 0

3, which in practice is secured at the side of the i gg free i g plates t locomotive Mama 7 n e present em odiment he piston rod 2| The cross head 4 of the structure comprises is Slit as Shown at 23, and the portions thus two separate plates 5, each provided with flanges Q are bolted together at the rear of the i5 slidably engaging the Ways 2, the wearing faces tP a 2; 231pa5ed through orifices in these 3 of the flanges being faced with lining metal in lens 115 C eslllhg the piston rod tightly the usual manner; the spacer block 1 engaging upon the pin. The Wrist pin is further secured the plates at parts thereof adjacent the guide; fmm turning in the by f key 24 of and bolts 53 passed through the plates and Spacer well-known construction, this key being disposed block holding them rigidly together. The plates m key-Ways formed in the pin f piston 40 are provided with grooves 9 and the block with forward of the pin. Instead of splitting the end tongues iii fitting within the grooves and'the' 0f the piston rod it may be made solid and the upner face a I of the block Slidably engages the Wrist pin may be pressed Within the orifice therelower face 12 of the guide, thereby providing a of h piston rod main rod jaws are y rigid joint between the block and plates. placedin l ne, the Key 24 be ng applied as before. 15 The Strucm f th h The pin is hollow b0 provide a chamber 25 for t I er compfilsles means W 19 containing lubricant, preferably grease, and has Engages he hates t Parts t ereof Spaced from passageways 26 through which the grease may B i 0f eflgagement by the block and pass to the bushings and pin engaging faces c p s a wrlst p and a bolt M as thereof. The bolt 14 is provided with an axial 50 iuhrellgh the plates and p holding them e bore 2? open at its outer end and connected to together. the chamber 25 by a radial bore 28 providing 'IZhlS combination of plates, block, pm and semeans for filling the chamber with lubricant. cur ng bolts provides a rig d composite frame The outer end of the bore 21 will usually be prowhich it will be noted is entirely free and indevided with a closure, such for instance as an 55 Alemite fitting (not shown). The orifices in the branches l9 and 20 of the main rod areprovided with bushings 29.

Referring to Fig. 6, the bushings 29 are here replaced by frictionless bearings 30. Obviously, if desired, the piston rod may be forked instead of the main rod, and the main rod forward end disposed between the branches of the fork, in which case the main rod will require but one bushing or frictionless bearing as the case may be.

Any suitable type of frictionless bearing may be employed. In the present instance a bearing of the conical roller type is shown more or less diagrammatically and comprises conical rollers 3| having their axes inclined inwardly toward the axis of the pin, an outer raceway 32, an inner raceway 33, and inner and outer end discs or plates 34 and 35. Between each outer end disc 35 and the adjacent cross head plate, disc-shaped shims 38 are disposed to provide for proper adjustment of the frictionless bearings when the arrangement is assembled, and as the bearing becomes worn and adjustment is made in View thereof, one or more shims will be added.

The pin I3 is provided with passageways 3'! leading from the chamber 25' to openings 38 provided between the inner raceway 33 and the inner end disc 34 for lubricating the raceways and rollers.

The outer raceways 32 are prevented from moving inwardly by the shoulders 39. It will be noted that the face of the pin I3 is not of the stepped type of the pin I3. In the structure of Fig. 6, after the pin and rods have been assembled, the frictionless bearings are assembled and finally the plates and bolts.

Except as already described the cross head I structure of Fig. 6 is similar to that of Figs. 1 to 5.

The preferred embodiment of the cross head structure of the present invention has the advantages that there is a direct connection between the piston rod and main rod through the wrist pin; that there is provision for a selfalignment of the cross head with the guide before the wrist pin is drawn solidly home; and that there is a relatively low reciprocating weight. In these points of advantage the present invention is similar to that covered by applicants copending application Serial No. 210,791 (Patent N0. 2,195,376, issued March 26, 1940) A further feature of the present invention is the simplified guide which is formed in one piece having a central web and laterally extending flanges providing therebetween ways for the flanges of the cross head, which is the reverse of usual practice. The guide being made in one piece is simpler to manufacture than the usual two-piece guide. Furthermore on account of the ways being directed outwardly the guide is cheaper to manufacture than the usual one-piece guide where the ways are directed inwardly. This one-piece type of guide also permits the cross head plates to be removed forrelining without disturbing the wrist-pin-rod assemblage.

While there have been hereinbefore described a preferred embodiment of this invention and a modification thereof, it will be understood that many and various changes and modifications in form, arrangement of parts and details of construction thereof may be made without departing from the spirit of the invention and that all such changes and modifications as fall within the scope of the appended claims are contemplated as a part of this invention.

The invention claimed and. desired to be secured by Letters Patent is: v

1. A locomotive cross head structure comprising a piston rod; a main rod, said rods having adjacent ends, each provided with an orifice for mounting them upon a wrist pin, one of said rods at its said adjacent end being forked and the other of said rods having its said adjacent end disposed between the branches of said fork; a guide; a cross head having means slidably engaging said guide and separate spaced side plates extending from and carried by said means, said plates being separable from each other independently of said rods, a spacer block disposed between said plates, and bolts rigidly securing said spacer block and plates together, thereby holding said plates in fixed spaced relation at parts thereof disposed in the proximity of said guide; a wrist pin upon which said adjacent ends of said rods are mounted, said wrist pin holding said plates apart in fixed spaced relation at parts thereof spaced from said first mentioned parts; and a bolt extending through said plates and said wrist pin, rigidly securing said wrist pin and plates together.

2. A locomotive cross head structure comprising a guide for a cross head, said guide having horizontal spaced flanges providing oppositely disposed guide ways; a cross head having a pair of transversely spaced longitudinally extending separable side plates, the upper end portions of which have horizontal flanges disposed in said ways in sliding engagement with said guide flanges, whereby said cross head is carried by said guide flanges, and the lower ends of which suspend free; means holding said upper end portions in fixed spaced relation; a wrist pin disposed between said plates holding said lower ends against movement toward each other, said wrist pin having faces abutting each of said plates; means holding said lower ends against movement away from each other; and means providing an interfit between said wrist pin and each of said plates whereby said wrist pin is supportedly carried by said plates.

3. The combination of a locomotive cross head comprising two spaced outer plates, means spanning said plates and securing them rigidly together in their spaced relation, and a wrist pin spanning said plates within the space therebetween and carried thereby; a main rod; a piston rod, each of said rods being mounted upon said wrist pin within the space between said plates; and a cross head guide having a central vertical rib within said space between said plates, said rib having at each side thereof spaced flanges projecting therefrom toward the adjacent plate and each plate having spaced flanges projecting from its inner face toward the adjacent rib side and interfitting with the flanges thereof in sliding relation therewith.

HARRY S. BURNHAM. 

